215460451 has 2 divisors, whose sum is σ = 215460452. Its totient is φ = 215460450.

The previous prime is 215460439. The next prime is 215460461. The reversal of 215460451 is 154064512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215460451 is a prime.

It is not a weakly prime, because it can be changed into another prime (215460461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107730225 + 107730226.

It is an arithmetic number, because the mean of its divisors is an integer number (107730226).

Almost surely, 2^215460451 is an apocalyptic number.

215460451 is a deficient number, since it is larger than the sum of its proper divisors (1).

215460451 is an equidigital number, since it uses as much as digits as its factorization.

215460451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 215460451 is about 14678.5711498088. The cubic root of 215460451 is about 599.5000010434.

The spelling of 215460451 in words is "two hundred fifteen million, four hundred sixty thousand, four hundred fifty-one".