155869801 has 2 divisors, whose sum is σ = 155869802. Its totient is φ = 155869800.

The previous prime is 155869793. The next prime is 155869807. The reversal of 155869801 is 108968551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126450025 + 29419776 = 11245^2 + 5424^2 .

It is a cyclic number.

It is not a de Polignac number, because 155869801 - 2³ = 155869793 is a prime.

It is not a weakly prime, because it can be changed into another prime (155869807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77934900 + 77934901.

It is an arithmetic number, because the mean of its divisors is an integer number (77934901).

Almost surely, 2^155869801 is an apocalyptic number.

It is an amenable number.

155869801 is a deficient number, since it is larger than the sum of its proper divisors (1).

155869801 is an equidigital number, since it uses as much as digits as its factorization.

155869801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 43.

The square root of 155869801 is about 12484.7827774455. The cubic root of 155869801 is about 538.1714569398.

The spelling of 155869801 in words is "one hundred fifty-five million, eight hundred sixty-nine thousand, eight hundred one".