651351493 has 4 divisors (see below), whose sum is σ = 701455468. Its totient is φ = 601247520.

The previous prime is 651351469. The next prime is 651351511. The reversal of 651351493 is 394153156.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 130005604 + 521345889 = 11402^2 + 22833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651351493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651351193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25051968 + ... + 25051993.

It is an arithmetic number, because the mean of its divisors is an integer number (175363867).

Almost surely, 2^651351493 is an apocalyptic number.

It is an amenable number.

651351493 is a deficient number, since it is larger than the sum of its proper divisors (50103975).

651351493 is a wasteful number, since it uses less digits than its factorization.

651351493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50103974.

The product of its digits is 48600, while the sum is 37.

The square root of 651351493 is about 25521.5887632412. The cubic root of 651351493 is about 866.8390569466.

The spelling of 651351493 in words is "six hundred fifty-one million, three hundred fifty-one thousand, four hundred ninety-three".