31551061 has 4 divisors (see below), whose sum is σ = 31714732. Its totient is φ = 31387392.

The previous prime is 31551019. The next prime is 31551067. The reversal of 31551061 is 16015513.

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 9036036 + 22515025 = 3006^2 + 4745^2 .

It is a cyclic number.

It is not a de Polignac number, because 31551061 - 2¹⁹ = 31026773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31551067) 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, 81546 + ... + 81931.

It is an arithmetic number, because the mean of its divisors is an integer number (7928683).

Almost surely, 2^31551061 is an apocalyptic number.

It is an amenable number.

31551061 is a deficient number, since it is larger than the sum of its proper divisors (163671).

31551061 is a wasteful number, since it uses less digits than its factorization.

31551061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163670.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 31551061 is about 5617.0331136642. The cubic root of 31551061 is about 315.9885330721.

Adding to 31551061 its reverse (16015513), we get a palindrome (47566574).

The spelling of 31551061 in words is "thirty-one million, five hundred fifty-one thousand, sixty-one".