851515051 has 2 divisors, whose sum is σ = 851515052. Its totient is φ = 851515050.

The previous prime is 851514971. The next prime is 851515069. The reversal of 851515051 is 150515158.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 851515051 - 2⁹ = 851514539 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (851515751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425757525 + 425757526.

It is an arithmetic number, because the mean of its divisors is an integer number (425757526).

Almost surely, 2^851515051 is an apocalyptic number.

851515051 is a deficient number, since it is larger than the sum of its proper divisors (1).

851515051 is an equidigital number, since it uses as much as digits as its factorization.

851515051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5000, while the sum is 31.

The square root of 851515051 is about 29180.7308167565. The cubic root of 851515051 is about 947.8307108530.

The spelling of 851515051 in words is "eight hundred fifty-one million, five hundred fifteen thousand, fifty-one".