157861021 has 8 divisors (see below), whose sum is σ = 163678464. Its totient is φ = 152088960.

The previous prime is 157861019. The next prime is 157861027. The reversal of 157861021 is 120168751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 157861021 - 2¹ = 157861019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157861027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4180 + ... + 18253.

It is an arithmetic number, because the mean of its divisors is an integer number (20459808).

Almost surely, 2^157861021 is an apocalyptic number.

It is an amenable number.

157861021 is a deficient number, since it is larger than the sum of its proper divisors (5817443).

157861021 is a wasteful number, since it uses less digits than its factorization.

157861021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22691.

The product of its (nonzero) digits is 3360, while the sum is 31.

The square root of 157861021 is about 12564.2755859620. The cubic root of 157861021 is about 540.4534611237.

It can be divided in two parts, 15786 and 1021, that added together give a 5-th power (16807 = 7⁵).

The spelling of 157861021 in words is "one hundred fifty-seven million, eight hundred sixty-one thousand, twenty-one".