291971401 has 2 divisors, whose sum is σ = 291971402. Its totient is φ = 291971400.

The previous prime is 291971371. The next prime is 291971411. The reversal of 291971401 is 104179192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239785225 + 52186176 = 15485^2 + 7224^2 .

It is a cyclic number.

It is not a de Polignac number, because 291971401 - 2⁵ = 291971369 is a prime.

It is not a weakly prime, because it can be changed into another prime (291971411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145985700 + 145985701.

It is an arithmetic number, because the mean of its divisors is an integer number (145985701).

Almost surely, 2^291971401 is an apocalyptic number.

It is an amenable number.

291971401 is a deficient number, since it is larger than the sum of its proper divisors (1).

291971401 is an equidigital number, since it uses as much as digits as its factorization.

291971401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 291971401 is about 17087.1706552021. The cubic root of 291971401 is about 663.4070838487.

The spelling of 291971401 in words is "two hundred ninety-one million, nine hundred seventy-one thousand, four hundred one".