31066157 has 4 divisors (see below), whose sum is σ = 32893596. Its totient is φ = 29238720.

The previous prime is 31066127. The next prime is 31066171. The reversal of 31066157 is 75166013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75166013 = 13 ⋅5782001.

It can be written as a sum of positive squares in 2 ways, for example, as 12524521 + 18541636 = 3539^2 + 4306^2 .

It is a cyclic number.

It is not a de Polignac number, because 31066157 - 2⁸ = 31065901 is a prime.

It is a super-2 number, since 2×31066157² = 1930212221497298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31066117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 913694 + ... + 913727.

It is an arithmetic number, because the mean of its divisors is an integer number (8223399).

Almost surely, 2^31066157 is an apocalyptic number.

It is an amenable number.

31066157 is a deficient number, since it is larger than the sum of its proper divisors (1827439).

31066157 is a wasteful number, since it uses less digits than its factorization.

31066157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827438.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 31066157 is about 5573.7022704841. The cubic root of 31066157 is about 314.3613734712.

The spelling of 31066157 in words is "thirty-one million, sixty-six thousand, one hundred fifty-seven".