31561055 has 8 divisors (see below), whose sum is σ = 37910592. Its totient is φ = 25223968.

The previous prime is 31561043. The next prime is 31561067. The reversal of 31561055 is 55016513.

It is an interprime number because it is at equal distance from previous prime (31561043) and next prime (31561067).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31561055 - 2⁸ = 31560799 is a prime.

It is a super-2 number, since 2×31561055² = 1992200385426050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3914 + ... + 8856.

It is an arithmetic number, because the mean of its divisors is an integer number (4738824).

Almost surely, 2^31561055 is an apocalyptic number.

31561055 is a deficient number, since it is larger than the sum of its proper divisors (6349537).

31561055 is a wasteful number, since it uses less digits than its factorization.

31561055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6225.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 31561055 is about 5617.9226587770. The cubic root of 31561055 is about 316.0218933451.

Adding to 31561055 its reverse (55016513), we get a palindrome (86577568).

The spelling of 31561055 in words is "thirty-one million, five hundred sixty-one thousand, fifty-five".