31660901 has 4 divisors (see below), whose sum is σ = 31687500. Its totient is φ = 31634304.

The previous prime is 31660883. The next prime is 31660927. The reversal of 31660901 is 10906613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10906613 = 1327 ⋅8219.

It can be written as a sum of positive squares in 2 ways, for example, as 12432676 + 19228225 = 3526^2 + 4385^2 .

It is a cyclic number.

It is not a de Polignac number, because 31660901 - 2¹⁰ = 31659877 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 (31660961) 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, 11426 + ... + 13923.

It is an arithmetic number, because the mean of its divisors is an integer number (7921875).

Almost surely, 2^31660901 is an apocalyptic number.

It is an amenable number.

31660901 is a deficient number, since it is larger than the sum of its proper divisors (26599).

31660901 is a wasteful number, since it uses less digits than its factorization.

31660901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26598.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 31660901 is about 5626.8020224636. The cubic root of 31660901 is about 316.3547963090.

The spelling of 31660901 in words is "thirty-one million, six hundred sixty thousand, nine hundred one".