157821953 has 2 divisors, whose sum is σ = 157821954. Its totient is φ = 157821952.

The previous prime is 157821949. The next prime is 157821959. The reversal of 157821953 is 359128751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150601984 + 7219969 = 12272^2 + 2687^2 .

It is an emirp because it is prime and its reverse (359128751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157821953 - 2² = 157821949 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 157821953.

It is not a weakly prime, because it can be changed into another prime (157821959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78910976 + 78910977.

It is an arithmetic number, because the mean of its divisors is an integer number (78910977).

Almost surely, 2^157821953 is an apocalyptic number.

It is an amenable number.

157821953 is a deficient number, since it is larger than the sum of its proper divisors (1).

157821953 is an equidigital number, since it uses as much as digits as its factorization.

157821953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 41.

The square root of 157821953 is about 12562.7207642294. The cubic root of 157821953 is about 540.4088730049.

The spelling of 157821953 in words is "one hundred fifty-seven million, eight hundred twenty-one thousand, nine hundred fifty-three".