156990751 has 4 divisors (see below), whose sum is σ = 157042600. Its totient is φ = 156938904.

The previous prime is 156990719. The next prime is 156990761. The reversal of 156990751 is 157099651.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 156990751 - 2⁵ = 156990719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 156990698 and 156990707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156990761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21081 + ... + 27538.

It is an arithmetic number, because the mean of its divisors is an integer number (39260650).

Almost surely, 2^156990751 is an apocalyptic number.

156990751 is a deficient number, since it is larger than the sum of its proper divisors (51849).

156990751 is an equidigital number, since it uses as much as digits as its factorization.

156990751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51848.

The product of its (nonzero) digits is 85050, while the sum is 43.

The square root of 156990751 is about 12529.5950054262. The cubic root of 156990751 is about 539.4584774797.

Subtracting 156990751 from its reverse (157099651), we obtain a square (108900 = 330²).

The spelling of 156990751 in words is "one hundred fifty-six million, nine hundred ninety thousand, seven hundred fifty-one".