157419781 has 2 divisors, whose sum is σ = 157419782. Its totient is φ = 157419780.

The previous prime is 157419763. The next prime is 157419809. The reversal of 157419781 is 187914751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156500100 + 919681 = 12510^2 + 959^2 .

It is a cyclic number.

It is not a de Polignac number, because 157419781 - 2⁵ = 157419749 is a prime.

It is a super-2 number, since 2×157419781² = 49561974900175922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157419701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78709890 + 78709891.

It is an arithmetic number, because the mean of its divisors is an integer number (78709891).

Almost surely, 2^157419781 is an apocalyptic number.

It is an amenable number.

157419781 is a deficient number, since it is larger than the sum of its proper divisors (1).

157419781 is an equidigital number, since it uses as much as digits as its factorization.

157419781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 43.

The square root of 157419781 is about 12546.7039894946. The cubic root of 157419781 is about 539.9494477140.

The spelling of 157419781 in words is "one hundred fifty-seven million, four hundred nineteen thousand, seven hundred eighty-one".