157815401 has 4 divisors (see below), whose sum is σ = 157964100. Its totient is φ = 157666704.

The previous prime is 157815379. The next prime is 157815409. The reversal of 157815401 is 104518751.

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 40309801 + 117505600 = 6349^2 + 10840^2 .

It is a cyclic number.

It is not a de Polignac number, because 157815401 - 2⁶ = 157815337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157815409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72746 + ... + 74883.

It is an arithmetic number, because the mean of its divisors is an integer number (39491025).

Almost surely, 2^157815401 is an apocalyptic number.

It is an amenable number.

157815401 is a deficient number, since it is larger than the sum of its proper divisors (148699).

157815401 is a wasteful number, since it uses less digits than its factorization.

157815401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148698.

The product of its (nonzero) digits is 5600, while the sum is 32.

The square root of 157815401 is about 12562.4599899860. The cubic root of 157815401 is about 540.4013945186.

The spelling of 157815401 in words is "one hundred fifty-seven million, eight hundred fifteen thousand, four hundred one".