981406507 has 2 divisors, whose sum is σ = 981406508. Its totient is φ = 981406506.

The previous prime is 981406499. The next prime is 981406513. The reversal of 981406507 is 705604189.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 981406507 - 2³ = 981406499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 981406507.

It is not a weakly prime, because it can be changed into another prime (981406607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490703253 + 490703254.

It is an arithmetic number, because the mean of its divisors is an integer number (490703254).

Almost surely, 2^981406507 is an apocalyptic number.

981406507 is a deficient number, since it is larger than the sum of its proper divisors (1).

981406507 is an equidigital number, since it uses as much as digits as its factorization.

981406507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 981406507 is about 31327.4082394315. The cubic root of 981406507 is about 993.7633541077.

The spelling of 981406507 in words is "nine hundred eighty-one million, four hundred six thousand, five hundred seven".