158720913 has 36 divisors (see below), whose sum is σ = 249861612. Its totient is φ = 97044480.

The previous prime is 158720879. The next prime is 158720941. The reversal of 158720913 is 319027851.

It can be written as a sum of positive squares in 6 ways, for example, as 33907329 + 124813584 = 5823^2 + 11172^2 .

It is a de Polignac number, because none of the positive numbers 2^k-158720913 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (158720413) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 366345 + ... + 366777.

Almost surely, 2^158720913 is an apocalyptic number.

158720913 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

158720913 is a deficient number, since it is larger than the sum of its proper divisors (91140699).

158720913 is a wasteful number, since it uses less digits than its factorization.

158720913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 158720913 is about 12598.4488330905. The cubic root of 158720913 is about 541.4329943205.

It can be divided in two parts, 1587 and 20913, that added together give a square (22500 = 150²).

The spelling of 158720913 in words is "one hundred fifty-eight million, seven hundred twenty thousand, nine hundred thirteen".