83490981 has 16 divisors (see below), whose sum is σ = 130664064. Its totient is φ = 46419264.

The previous prime is 83490973. The next prime is 83490983. The reversal of 83490981 is 18909438.

It is not a de Polignac number, because 83490981 - 2³ = 83490973 is a prime.

It is a super-2 number, since 2×83490981² = 13941487816684722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83490983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52950 + ... + 54503.

It is an arithmetic number, because the mean of its divisors is an integer number (8166504).

Almost surely, 2^83490981 is an apocalyptic number.

It is an amenable number.

83490981 is a deficient number, since it is larger than the sum of its proper divisors (47173083).

83490981 is a wasteful number, since it uses less digits than its factorization.

83490981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107500.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 83490981 is about 9137.3399301985. The cubic root of 83490981 is about 437.0654947070.

The spelling of 83490981 in words is "eighty-three million, four hundred ninety thousand, nine hundred eighty-one".