78551031 has 12 divisors (see below), whose sum is σ = 113411688. Its totient is φ = 48338784.

The previous prime is 78551029. The next prime is 78551041. The reversal of 78551031 is 13015587.

It is not a de Polignac number, because 78551031 - 2¹ = 78551029 is a prime.

It is a super-2 number, since 2×78551031² = 12340528942325922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78551031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78551041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76960 + ... + 77973.

It is an arithmetic number, because the mean of its divisors is an integer number (9450974).

Almost surely, 2^78551031 is an apocalyptic number.

78551031 is a deficient number, since it is larger than the sum of its proper divisors (34860657).

78551031 is a wasteful number, since it uses less digits than its factorization.

78551031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154962 (or 154949 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 78551031 is about 8862.9019513927. The cubic root of 78551031 is about 428.2696480418.

The spelling of 78551031 in words is "seventy-eight million, five hundred fifty-one thousand, thirty-one".