139216031 has 2 divisors, whose sum is σ = 139216032. Its totient is φ = 139216030.

The previous prime is 139215977. The next prime is 139216039. The reversal of 139216031 is 130612931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139216031 is a prime.

It is a super-2 number, since 2×139216031² = 38762206574785922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139216039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69608015 + 69608016.

It is an arithmetic number, because the mean of its divisors is an integer number (69608016).

Almost surely, 2^139216031 is an apocalyptic number.

139216031 is a deficient number, since it is larger than the sum of its proper divisors (1).

139216031 is an equidigital number, since it uses as much as digits as its factorization.

139216031 is an evil number, because the sum of its binary digits is even.

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

The square root of 139216031 is about 11798.9843206947. The cubic root of 139216031 is about 518.2783681430.

Adding to 139216031 its reverse (130612931), we get a palindrome (269828962).

The spelling of 139216031 in words is "one hundred thirty-nine million, two hundred sixteen thousand, thirty-one".