1521634157 has 16 divisors (see below), whose sum is σ = 1574951040. Its totient is φ = 1469529600.

The previous prime is 1521634073. The next prime is 1521634217. The reversal of 1521634157 is 7514361251.

It is a happy number.

It is not a de Polignac number, because 1521634157 - 2⁸ = 1521633901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521634357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 712982 + ... + 715112.

It is an arithmetic number, because the mean of its divisors is an integer number (98434440).

Almost surely, 2^1521634157 is an apocalyptic number.

It is an amenable number.

1521634157 is a deficient number, since it is larger than the sum of its proper divisors (53316883).

1521634157 is a wasteful number, since it uses less digits than its factorization.

1521634157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404.

The product of its digits is 25200, while the sum is 35.

The square root of 1521634157 is about 39008.1293706837. The cubic root of 1521634157 is about 1150.1913120912.

The spelling of 1521634157 in words is "one billion, five hundred twenty-one million, six hundred thirty-four thousand, one hundred fifty-seven".