70289251921 has 24 divisors (see below), whose sum is σ = 82413938376. Its totient is φ = 59770368000.

The previous prime is 70289251891. The next prime is 70289251951. The reversal of 70289251921 is 12915298207.

It is an interprime number because it is at equal distance from previous prime (70289251891) and next prime (70289251951).

It can be written as a sum of positive squares in 4 ways, for example, as 13805075025 + 56484176896 = 117495^2 + 237664^2 .

It is not a de Polignac number, because 70289251921 - 2⁵ = 70289251889 is a prime.

It is a super-2 number, since 2×70289251921² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (70289251951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17565921 + ... + 17569921.

It is an arithmetic number, because the mean of its divisors is an integer number (3433914099).

Almost surely, 2^70289251921 is an apocalyptic number.

It is an amenable number.

70289251921 is a deficient number, since it is larger than the sum of its proper divisors (12124686455).

70289251921 is a wasteful number, since it uses less digits than its factorization.

70289251921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6769 (or 6762 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 70289251921 in words is "seventy billion, two hundred eighty-nine million, two hundred fifty-one thousand, nine hundred twenty-one".