157221851 has 2 divisors, whose sum is σ = 157221852. Its totient is φ = 157221850.

The previous prime is 157221833. The next prime is 157221871. The reversal of 157221851 is 158122751.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 157221851 - 2⁶ = 157221787 is a prime.

It is equal to p_8827430 and since 157221851 and 8827430 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (157221871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78610925 + 78610926.

It is an arithmetic number, because the mean of its divisors is an integer number (78610926).

Almost surely, 2^157221851 is an apocalyptic number.

157221851 is a deficient number, since it is larger than the sum of its proper divisors (1).

157221851 is an equidigital number, since it uses as much as digits as its factorization.

157221851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5600, while the sum is 32.

The square root of 157221851 is about 12538.8137796205. The cubic root of 157221851 is about 539.7230530039.

The spelling of 157221851 in words is "one hundred fifty-seven million, two hundred twenty-one thousand, eight hundred fifty-one".