157120781 has 8 divisors (see below), whose sum is σ = 158403840. Its totient is φ = 155842128.

The previous prime is 157120739. The next prime is 157120801. The reversal of 157120781 is 187021751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157120781 is a prime.

It is a super-2 number, since 2×157120781² = 49373879644099922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157122781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117740 + ... + 119066.

It is an arithmetic number, because the mean of its divisors is an integer number (19800480).

Almost surely, 2^157120781 is an apocalyptic number.

It is an amenable number.

157120781 is a deficient number, since it is larger than the sum of its proper divisors (1283059).

157120781 is a wasteful number, since it uses less digits than its factorization.

157120781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2203.

The product of its (nonzero) digits is 3920, while the sum is 32.

The square root of 157120781 is about 12534.7828461446. The cubic root of 157120781 is about 539.6073746341.

The spelling of 157120781 in words is "one hundred fifty-seven million, one hundred twenty thousand, seven hundred eighty-one".