1976320691 has 2 divisors, whose sum is σ = 1976320692. Its totient is φ = 1976320690.

The previous prime is 1976320613. The next prime is 1976320727. The reversal of 1976320691 is 1960236791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1976320691 - 2¹⁴ = 1976304307 is a prime.

It is not a weakly prime, because it can be changed into another prime (1976370691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988160345 + 988160346.

It is an arithmetic number, because the mean of its divisors is an integer number (988160346).

Almost surely, 2^1976320691 is an apocalyptic number.

1976320691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1976320691 is an equidigital number, since it uses as much as digits as its factorization.

1976320691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 1976320691 is about 44455.8285379994. The cubic root of 1976320691 is about 1254.9289528729.

The spelling of 1976320691 in words is "one billion, nine hundred seventy-six million, three hundred twenty thousand, six hundred ninety-one".