731550401 has 2 divisors, whose sum is σ = 731550402. Its totient is φ = 731550400.

The previous prime is 731550371. The next prime is 731550461. The reversal of 731550401 is 104055137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 729054001 + 2496400 = 27001^2 + 1580^2 .

It is a cyclic number.

It is not a de Polignac number, because 731550401 - 2²⁶ = 664441537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (731550461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365775200 + 365775201.

It is an arithmetic number, because the mean of its divisors is an integer number (365775201).

Almost surely, 2^731550401 is an apocalyptic number.

It is an amenable number.

731550401 is a deficient number, since it is larger than the sum of its proper divisors (1).

731550401 is an equidigital number, since it uses as much as digits as its factorization.

731550401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 731550401 is about 27047.1884121067. The cubic root of 731550401 is about 901.0483261650.

Subtracting from 731550401 its sum of digits (26), we obtain a triangular number (731550375 = T₃₈₂₅₀).

The spelling of 731550401 in words is "seven hundred thirty-one million, five hundred fifty thousand, four hundred one".