401497091 has 2 divisors, whose sum is σ = 401497092. Its totient is φ = 401497090.

The previous prime is 401497087. The next prime is 401497093. The reversal of 401497091 is 190794104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401497091 - 2² = 401497087 is a prime.

It is a super-2 number, since 2×401497091² = 322399828162924562, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 401497093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (401497093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200748545 + 200748546.

It is an arithmetic number, because the mean of its divisors is an integer number (200748546).

Almost surely, 2^401497091 is an apocalyptic number.

401497091 is a deficient number, since it is larger than the sum of its proper divisors (1).

401497091 is an equidigital number, since it uses as much as digits as its factorization.

401497091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 401497091 is about 20037.3923203595. The cubic root of 401497091 is about 737.7243770412.

The spelling of 401497091 in words is "four hundred one million, four hundred ninety-seven thousand, ninety-one".