157742969 has 2 divisors, whose sum is σ = 157742970. Its totient is φ = 157742968.

The previous prime is 157742939. The next prime is 157742971. The reversal of 157742969 is 969247751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106090000 + 51652969 = 10300^2 + 7187^2 .

It is a cyclic number.

It is not a de Polignac number, because 157742969 - 2¹² = 157738873 is a prime.

It is a super-2 number, since 2×157742969² = 49765688537869922, which contains 22 as substring.

Together with 157742971, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (157742909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78871484 + 78871485.

It is an arithmetic number, because the mean of its divisors is an integer number (78871485).

Almost surely, 2^157742969 is an apocalyptic number.

It is an amenable number.

157742969 is a deficient number, since it is larger than the sum of its proper divisors (1).

157742969 is an equidigital number, since it uses as much as digits as its factorization.

157742969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 50.

The square root of 157742969 is about 12559.5767842710. The cubic root of 157742969 is about 540.3187064678.

The spelling of 157742969 in words is "one hundred fifty-seven million, seven hundred forty-two thousand, nine hundred sixty-nine".