155394013 has 2 divisors, whose sum is σ = 155394014. Its totient is φ = 155394012.

The previous prime is 155394007. The next prime is 155394053. The reversal of 155394013 is 310493551.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144648729 + 10745284 = 12027^2 + 3278^2 .

It is a cyclic number.

It is not a de Polignac number, because 155394013 - 2⁹ = 155393501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155394053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77697006 + 77697007.

It is an arithmetic number, because the mean of its divisors is an integer number (77697007).

Almost surely, 2^155394013 is an apocalyptic number.

It is an amenable number.

155394013 is a deficient number, since it is larger than the sum of its proper divisors (1).

155394013 is an equidigital number, since it uses as much as digits as its factorization.

155394013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 155394013 is about 12465.7134974297. The cubic root of 155394013 is about 537.6233146308.

The spelling of 155394013 in words is "one hundred fifty-five million, three hundred ninety-four thousand, thirteen".