157374821 has 2 divisors, whose sum is σ = 157374822. Its totient is φ = 157374820.

The previous prime is 157374803. The next prime is 157374859. The reversal of 157374821 is 128473751.

It is an a-pointer prime, because the next prime (157374859) can be obtained adding 157374821 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79405921 + 77968900 = 8911^2 + 8830^2 .

It is a cyclic number.

It is not a de Polignac number, because 157374821 - 2¹⁸ = 157112677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157374871) 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 as a sum of consecutive naturals, namely, 78687410 + 78687411.

It is an arithmetic number, because the mean of its divisors is an integer number (78687411).

Almost surely, 2^157374821 is an apocalyptic number.

It is an amenable number.

157374821 is a deficient number, since it is larger than the sum of its proper divisors (1).

157374821 is an equidigital number, since it uses as much as digits as its factorization.

157374821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 38.

The square root of 157374821 is about 12544.9121559300. The cubic root of 157374821 is about 539.8980385909.

The spelling of 157374821 in words is "one hundred fifty-seven million, three hundred seventy-four thousand, eight hundred twenty-one".