36901981 has 4 divisors (see below), whose sum is σ = 37316700. Its totient is φ = 36487264.

The previous prime is 36901979. The next prime is 36901993. The reversal of 36901981 is 18910963.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5597956 + 31304025 = 2366^2 + 5595^2 .

It is a cyclic number.

It is not a de Polignac number, because 36901981 - 2¹ = 36901979 is a prime.

It is a super-2 number, since 2×36901981² = 2723512403448722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 36901981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36901481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207226 + ... + 207403.

It is an arithmetic number, because the mean of its divisors is an integer number (9329175).

Almost surely, 2^36901981 is an apocalyptic number.

It is an amenable number.

36901981 is a deficient number, since it is larger than the sum of its proper divisors (414719).

36901981 is an equidigital number, since it uses as much as digits as its factorization.

36901981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414718.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 36901981 is about 6074.7000749008. The cubic root of 36901981 is about 332.9276717385.

It can be divided in two parts, 3690 and 1981, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 36901981 in words is "thirty-six million, nine hundred one thousand, nine hundred eighty-one".