1601297251 has 2 divisors, whose sum is σ = 1601297252. Its totient is φ = 1601297250.

The previous prime is 1601297249. The next prime is 1601297273. The reversal of 1601297251 is 1527921061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1601297251 - 2¹ = 1601297249 is a prime.

Together with 1601297249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1601297351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800648625 + 800648626.

It is an arithmetic number, because the mean of its divisors is an integer number (800648626).

Almost surely, 2^1601297251 is an apocalyptic number.

1601297251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601297251 is an equidigital number, since it uses as much as digits as its factorization.

1601297251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 1601297251 is about 40016.2123519955. The cubic root of 1601297251 is about 1169.9231086391.

The spelling of 1601297251 in words is "one billion, six hundred one million, two hundred ninety-seven thousand, two hundred fifty-one".