157121049 has 4 divisors (see below), whose sum is σ = 209494736. Its totient is φ = 104747364.

The previous prime is 157121033. The next prime is 157121057. The reversal of 157121049 is 940121751.

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: 940121751 = 3 ⋅313373917.

It is not a de Polignac number, because 157121049 - 2⁴ = 157121033 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (157121099) 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, 26186839 + ... + 26186844.

It is an arithmetic number, because the mean of its divisors is an integer number (52373684).

Almost surely, 2^157121049 is an apocalyptic number.

It is an amenable number.

157121049 is a deficient number, since it is larger than the sum of its proper divisors (52373687).

157121049 is an equidigital number, since it uses as much as digits as its factorization.

157121049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52373686.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 157121049 is about 12534.7935363930. The cubic root of 157121049 is about 539.6076814357.

It can be divided in two parts, 15712 and 1049, that added together give a palindrome (16761).

The spelling of 157121049 in words is "one hundred fifty-seven million, one hundred twenty-one thousand, forty-nine".