70920531 has 24 divisors (see below), whose sum is σ = 112057920. Its totient is φ = 42865200.

The previous prime is 70920517. The next prime is 70920539. The reversal of 70920531 is 13502907.

It is a de Polignac number, because none of the positive numbers 2^k-70920531 is a prime.

It is a super-2 number, since 2×70920531² = 10059443434643922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 70920495 and 70920504.

It is not an unprimeable number, because it can be changed into a prime (70920539) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47880 + ... + 49338.

It is an arithmetic number, because the mean of its divisors is an integer number (4669080).

Almost surely, 2^70920531 is an apocalyptic number.

70920531 is a deficient number, since it is larger than the sum of its proper divisors (41137389).

70920531 is a wasteful number, since it uses less digits than its factorization.

70920531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967 (or 1964 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 70920531 is about 8421.4328353315. The cubic root of 70920531 is about 413.9272258837.

The spelling of 70920531 in words is "seventy million, nine hundred twenty thousand, five hundred thirty-one".