651021451 has 2 divisors, whose sum is σ = 651021452. Its totient is φ = 651021450.

The previous prime is 651021439. The next prime is 651021467. The reversal of 651021451 is 154120156.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 651021451 - 2⁷ = 651021323 is a prime.

It is not a weakly prime, because it can be changed into another prime (651021751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325510725 + 325510726.

It is an arithmetic number, because the mean of its divisors is an integer number (325510726).

Almost surely, 2^651021451 is an apocalyptic number.

651021451 is a deficient number, since it is larger than the sum of its proper divisors (1).

651021451 is an equidigital number, since it uses as much as digits as its factorization.

651021451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 651021451 is about 25515.1220063710. The cubic root of 651021451 is about 866.6926221188.

The spelling of 651021451 in words is "six hundred fifty-one million, twenty-one thousand, four hundred fifty-one".