1500401261 has 2 divisors, whose sum is σ = 1500401262. Its totient is φ = 1500401260.

The previous prime is 1500401207. The next prime is 1500401263. The reversal of 1500401261 is 1621040051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 916212361 + 584188900 = 30269^2 + 24170^2 .

It is a cyclic number.

It is not a de Polignac number, because 1500401261 - 2⁶ = 1500401197 is a prime.

Together with 1500401263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1500401263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 750200630 + 750200631.

It is an arithmetic number, because the mean of its divisors is an integer number (750200631).

Almost surely, 2^1500401261 is an apocalyptic number.

It is an amenable number.

1500401261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1500401261 is an equidigital number, since it uses as much as digits as its factorization.

1500401261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1500401261 is about 38735.0133729162. The cubic root of 1500401261 is about 1144.8163066044.

The spelling of 1500401261 in words is "one billion, five hundred million, four hundred one thousand, two hundred sixty-one".