157731026949 has 20 divisors (see below), whose sum is σ = 236600609740. Its totient is φ = 104717681280.

The previous prime is 157731026939. The next prime is 157731026963. The reversal of 157731026949 is 949620137751.

157731026949 is a `hidden beast` number, since 1 + 577 + 3 + 1 + 0 + 2 + 69 + 4 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 82824810849 + 74906216100 = 287793^2 + 273690^2 .

It is not a de Polignac number, because 157731026949 - 2⁸ = 157731026693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 157731026895 and 157731026904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157731026939) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4020514 + ... + 4059555.

It is an arithmetic number, because the mean of its divisors is an integer number (11830030487).

Almost surely, 2^157731026949 is an apocalyptic number.

It is an amenable number.

157731026949 is a deficient number, since it is larger than the sum of its proper divisors (78869582791).

157731026949 is an equidigital number, since it uses as much as digits as its factorization.

157731026949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8080322 (or 8080313 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The spelling of 157731026949 in words is "one hundred fifty-seven billion, seven hundred thirty-one million, twenty-six thousand, nine hundred forty-nine".