155657741 has 2 divisors, whose sum is σ = 155657742. Its totient is φ = 155657740.

The previous prime is 155657731. The next prime is 155657783. The reversal of 155657741 is 147756551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144240100 + 11417641 = 12010^2 + 3379^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155657741 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_8744477 and since 155657741 and 8744477 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155657731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77828870 + 77828871.

It is an arithmetic number, because the mean of its divisors is an integer number (77828871).

Almost surely, 2^155657741 is an apocalyptic number.

It is an amenable number.

155657741 is a deficient number, since it is larger than the sum of its proper divisors (1).

155657741 is an equidigital number, since it uses as much as digits as its factorization.

155657741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147000, while the sum is 41.

The square root of 155657741 is about 12476.2871480261. The cubic root of 155657741 is about 537.9272864143.

The spelling of 155657741 in words is "one hundred fifty-five million, six hundred fifty-seven thousand, seven hundred forty-one".