15555401 has 2 divisors, whose sum is σ = 15555402. Its totient is φ = 15555400.

The previous prime is 15555389. The next prime is 15555413. The reversal of 15555401 is 10455551.

It is a balanced prime because it is at equal distance from previous prime (15555389) and next prime (15555413).

It can be written as a sum of positive squares in only one way, i.e., 12243001 + 3312400 = 3499^2 + 1820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15555401 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (15555301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7777700 + 7777701.

It is an arithmetic number, because the mean of its divisors is an integer number (7777701).

Almost surely, 2^15555401 is an apocalyptic number.

It is an amenable number.

15555401 is a deficient number, since it is larger than the sum of its proper divisors (1).

15555401 is an equidigital number, since it uses as much as digits as its factorization.

15555401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 15555401 is about 3944.0335951916. The cubic root of 15555401 is about 249.6282528235.

The spelling of 15555401 in words is "fifteen million, five hundred fifty-five thousand, four hundred one".