155687401 has 2 divisors, whose sum is σ = 155687402. Its totient is φ = 155687400.

The previous prime is 155687393. The next prime is 155687407. The reversal of 155687401 is 104786551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142181776 + 13505625 = 11924^2 + 3675^2 .

It is a cyclic number.

It is not a de Polignac number, because 155687401 - 2³ = 155687393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155687407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77843700 + 77843701.

It is an arithmetic number, because the mean of its divisors is an integer number (77843701).

Almost surely, 2^155687401 is an apocalyptic number.

It is an amenable number.

155687401 is a deficient number, since it is larger than the sum of its proper divisors (1).

155687401 is an equidigital number, since it uses as much as digits as its factorization.

155687401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 155687401 is about 12477.4757463198. The cubic root of 155687401 is about 537.9614509215.

The spelling of 155687401 in words is "one hundred fifty-five million, six hundred eighty-seven thousand, four hundred one".