31154661 has 36 divisors (see below), whose sum is σ = 48816768. Its totient is φ = 19132848.

The previous prime is 31154657. The next prime is 31154687. The reversal of 31154661 is 16645113.

It is not a de Polignac number, because 31154661 - 2² = 31154657 is a prime.

It is a super-2 number, since 2×31154661² = 1941225804049842, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31154611) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 139596 + ... + 139818.

Almost surely, 2^31154661 is an apocalyptic number.

It is an amenable number.

31154661 is a deficient number, since it is larger than the sum of its proper divisors (17662107).

31154661 is a wasteful number, since it uses less digits than its factorization.

31154661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 288 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 31154661 is about 5581.6360504784. The cubic root of 31154661 is about 314.6596172044.

Adding to 31154661 its reverse (16645113), we get a palindrome (47799774).

It can be divided in two parts, 3115 and 4661, that added together give a 5-th power (7776 = 6⁵).

The spelling of 31154661 in words is "thirty-one million, one hundred fifty-four thousand, six hundred sixty-one".