157216501 has 4 divisors (see below), whose sum is σ = 169310092. Its totient is φ = 145122912.

The previous prime is 157216487. The next prime is 157216513. The reversal of 157216501 is 105612751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 105612751 = 29 ⋅3641819.

It can be written as a sum of positive squares in 2 ways, for example, as 8352100 + 148864401 = 2890^2 + 12201^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157216501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157216501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157216541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6046776 + ... + 6046801.

It is an arithmetic number, because the mean of its divisors is an integer number (42327523).

Almost surely, 2^157216501 is an apocalyptic number.

It is an amenable number.

157216501 is a deficient number, since it is larger than the sum of its proper divisors (12093591).

157216501 is a wasteful number, since it uses less digits than its factorization.

157216501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12093590.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 157216501 is about 12538.6004402405. The cubic root of 157216501 is about 539.7169309730.

It can be divided in two parts, 15721 and 6501, that added together give a palindrome (22222).

The spelling of 157216501 in words is "one hundred fifty-seven million, two hundred sixteen thousand, five hundred one".