1031391601 has 2 divisors, whose sum is σ = 1031391602. Its totient is φ = 1031391600.

The previous prime is 1031391587. The next prime is 1031391617. The reversal of 1031391601 is 1061931301.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 900060001 + 131331600 = 30001^2 + 11460^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031391601 - 2⁹ = 1031391089 is a prime.

It is a super-2 number, since 2×1031391601² = 2127537269226686402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1031391401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515695800 + 515695801.

It is an arithmetic number, because the mean of its divisors is an integer number (515695801).

Almost surely, 2^1031391601 is an apocalyptic number.

It is an amenable number.

1031391601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031391601 is an equidigital number, since it uses as much as digits as its factorization.

1031391601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 1031391601 is about 32115.2860955651. The cubic root of 1031391601 is about 1010.3562449486.

The spelling of 1031391601 in words is "one billion, thirty-one million, three hundred ninety-one thousand, six hundred one".