61864031 has 4 divisors (see below), whose sum is σ = 62647200. Its totient is φ = 61080864.

The previous prime is 61864007. The next prime is 61864051. The reversal of 61864031 is 13046816.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61864031 is a prime.

It is a super-2 number, since 2×61864031² = 7654316663137922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61863985 and 61864003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61864001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391466 + ... + 391623.

It is an arithmetic number, because the mean of its divisors is an integer number (15661800).

Almost surely, 2^61864031 is an apocalyptic number.

61864031 is the 3518-th centered decagonal number.

61864031 is a deficient number, since it is larger than the sum of its proper divisors (783169).

61864031 is an equidigital number, since it uses as much as digits as its factorization.

61864031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783168.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 61864031 is about 7865.3690949631. The cubic root of 61864031 is about 395.4996209460.

The spelling of 61864031 in words is "sixty-one million, eight hundred sixty-four thousand, thirty-one".