157953989 has 2 divisors, whose sum is σ = 157953990. Its totient is φ = 157953988.

The previous prime is 157953947. The next prime is 157953997. The reversal of 157953989 is 989359751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154803364 + 3150625 = 12442^2 + 1775^2 .

It is a cyclic number.

It is not a de Polignac number, because 157953989 - 2¹² = 157949893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157953589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78976994 + 78976995.

It is an arithmetic number, because the mean of its divisors is an integer number (78976995).

Almost surely, 2^157953989 is an apocalyptic number.

It is an amenable number.

157953989 is a deficient number, since it is larger than the sum of its proper divisors (1).

157953989 is an equidigital number, since it uses as much as digits as its factorization.

157953989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3061800, while the sum is 56.

The square root of 157953989 is about 12567.9747374030. The cubic root of 157953989 is about 540.5595354770.

The spelling of 157953989 in words is "one hundred fifty-seven million, nine hundred fifty-three thousand, nine hundred eighty-nine".