157197643 has 2 divisors, whose sum is σ = 157197644. Its totient is φ = 157197642.

The previous prime is 157197581. The next prime is 157197647. The reversal of 157197643 is 346791751.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157197643 is a prime.

It is a super-2 number, since 2×157197643² = 49422197929510898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 157197643.

It is not a weakly prime, because it can be changed into another prime (157197647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78598821 + 78598822.

It is an arithmetic number, because the mean of its divisors is an integer number (78598822).

Almost surely, 2^157197643 is an apocalyptic number.

157197643 is a deficient number, since it is larger than the sum of its proper divisors (1).

157197643 is an equidigital number, since it uses as much as digits as its factorization.

157197643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 43.

The square root of 157197643 is about 12537.8484198845. The cubic root of 157197643 is about 539.6953505647.

The spelling of 157197643 in words is "one hundred fifty-seven million, one hundred ninety-seven thousand, six hundred forty-three".