157612729 has 4 divisors (see below), whose sum is σ = 166884084. Its totient is φ = 148341376.

The previous prime is 157612691. The next prime is 157612747. The reversal of 157612729 is 927216751.

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

It can be written as a sum of positive squares in 2 ways, for example, as 120121600 + 37491129 = 10960^2 + 6123^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157612729 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 157612691 and 157612700.

It is not an unprimeable number, because it can be changed into a prime (157612789) 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, 4635652 + ... + 4635685.

It is an arithmetic number, because the mean of its divisors is an integer number (41721021).

Almost surely, 2^157612729 is an apocalyptic number.

It is an amenable number.

157612729 is a deficient number, since it is larger than the sum of its proper divisors (9271355).

157612729 is an equidigital number, since it uses as much as digits as its factorization.

157612729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9271354.

The product of its digits is 52920, while the sum is 40.

The square root of 157612729 is about 12554.3908255240. The cubic root of 157612729 is about 540.1699613607.

The spelling of 157612729 in words is "one hundred fifty-seven million, six hundred twelve thousand, seven hundred twenty-nine".