1651515251 has 2 divisors, whose sum is σ = 1651515252. Its totient is φ = 1651515250.

The previous prime is 1651515247. The next prime is 1651515277. The reversal of 1651515251 is 1525151561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1651515251 - 2² = 1651515247 is a prime.

It is not a weakly prime, because it can be changed into another prime (1651515211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825757625 + 825757626.

It is an arithmetic number, because the mean of its divisors is an integer number (825757626).

Almost surely, 2^1651515251 is an apocalyptic number.

1651515251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651515251 is an equidigital number, since it uses as much as digits as its factorization.

1651515251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7500, while the sum is 32.

The square root of 1651515251 is about 40638.8391935597. The cubic root of 1651515251 is about 1182.0273610515.

The spelling of 1651515251 in words is "one billion, six hundred fifty-one million, five hundred fifteen thousand, two hundred fifty-one".