157204781 has 4 divisors (see below), whose sum is σ = 158083200. Its totient is φ = 156326364.

The previous prime is 157204777. The next prime is 157204787. The reversal of 157204781 is 187402751.

157204781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 187402751 = 197 ⋅951283.

It is a cyclic number.

It is not a de Polignac number, because 157204781 - 2² = 157204777 is a prime.

It is a super-2 number, since 2×157204781² = 49426686338515922, 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 (157204787) 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, 438941 + ... + 439298.

It is an arithmetic number, because the mean of its divisors is an integer number (39520800).

Almost surely, 2^157204781 is an apocalyptic number.

It is an amenable number.

157204781 is a deficient number, since it is larger than the sum of its proper divisors (878419).

157204781 is an equidigital number, since it uses as much as digits as its factorization.

157204781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878418.

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 157204781 is about 12538.1330747444. The cubic root of 157204781 is about 539.7035192349.

The spelling of 157204781 in words is "one hundred fifty-seven million, two hundred four thousand, seven hundred eighty-one".