157247491 has 2 divisors, whose sum is σ = 157247492. Its totient is φ = 157247490.

The previous prime is 157247473. The next prime is 157247513. The reversal of 157247491 is 194742751.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 157247491 - 2⁹ = 157246979 is a prime.

It is not a weakly prime, because it can be changed into another prime (157247471) 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, 78623745 + 78623746.

It is an arithmetic number, because the mean of its divisors is an integer number (78623746).

Almost surely, 2^157247491 is an apocalyptic number.

157247491 is a deficient number, since it is larger than the sum of its proper divisors (1).

157247491 is an equidigital number, since it uses as much as digits as its factorization.

157247491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 40.

The square root of 157247491 is about 12539.8361632040. The cubic root of 157247491 is about 539.7523910524.

The spelling of 157247491 in words is "one hundred fifty-seven million, two hundred forty-seven thousand, four hundred ninety-one".