155731457 has 6 divisors (see below), whose sum is σ = 181157058. Its totient is φ = 133484064.

The previous prime is 155731403. The next prime is 155731487. The reversal of 155731457 is 754137551.

It can be written as a sum of positive squares in only one way, i.e., 84345856 + 71385601 = 9184^2 + 8449^2 .

It is not a de Polignac number, because 155731457 - 2¹⁰ = 155730433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155731457.

It is not an unprimeable number, because it can be changed into a prime (155731487) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1589048 + ... + 1589145.

It is an arithmetic number, because the mean of its divisors is an integer number (30192843).

Almost surely, 2^155731457 is an apocalyptic number.

It is an amenable number.

155731457 is a deficient number, since it is larger than the sum of its proper divisors (25425601).

155731457 is an equidigital number, since it uses as much as digits as its factorization.

155731457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3178207 (or 3178200 counting only the distinct ones).

The product of its digits is 73500, while the sum is 38.

The square root of 155731457 is about 12479.2410426276. The cubic root of 155731457 is about 538.0121897617.

The spelling of 155731457 in words is "one hundred fifty-five million, seven hundred thirty-one thousand, four hundred fifty-seven".