781213023131 has 16 divisors (see below), whose sum is σ = 867847097088. Its totient is φ = 699876633600.

The previous prime is 781213023127. The next prime is 781213023187. The reversal of 781213023131 is 131320312187.

It is not a de Polignac number, because 781213023131 - 2² = 781213023127 is a prime.

It is a super-2 number, since 2×781213023131² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781213023631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12118490 + ... + 12182783.

It is an arithmetic number, because the mean of its divisors is an integer number (54240443568).

Almost surely, 2^781213023131 is an apocalyptic number.

781213023131 is a deficient number, since it is larger than the sum of its proper divisors (86634073957).

781213023131 is a wasteful number, since it uses less digits than its factorization.

781213023131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24301382.

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 781213023131 in words is "seven hundred eighty-one billion, two hundred thirteen million, twenty-three thousand, one hundred thirty-one".