1420957691 has 2 divisors, whose sum is σ = 1420957692. Its totient is φ = 1420957690.

The previous prime is 1420957667. The next prime is 1420957697. The reversal of 1420957691 is 1967590241.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1420957691 - 2¹⁸ = 1420695547 is a prime.

It is a super-2 number, since 2×1420957691² = 4038241519224102962, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1420957697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710478845 + 710478846.

It is an arithmetic number, because the mean of its divisors is an integer number (710478846).

Almost surely, 2^1420957691 is an apocalyptic number.

1420957691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1420957691 is an equidigital number, since it uses as much as digits as its factorization.

1420957691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 1420957691 is about 37695.5924611884. The cubic root of 1420957691 is about 1124.2434923213.

The spelling of 1420957691 in words is "one billion, four hundred twenty million, nine hundred fifty-seven thousand, six hundred ninety-one".