651637442 has 4 divisors (see below), whose sum is σ = 977456166. Its totient is φ = 325818720.

The previous prime is 651637423. The next prime is 651637457. The reversal of 651637442 is 244736156.

It is a happy number.

651637442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 639027841 + 12609601 = 25279^2 + 3551^2 .

It is a junction number, because it is equal to n+sod(n) for n = 651637396 and 651637405.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162909359 + ... + 162909362.

Almost surely, 2^651637442 is an apocalyptic number.

651637442 is a deficient number, since it is larger than the sum of its proper divisors (325818724).

651637442 is a wasteful number, since it uses less digits than its factorization.

651637442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325818723.

The product of its digits is 120960, while the sum is 38.

The square root of 651637442 is about 25527.1902488308. The cubic root of 651637442 is about 866.9658883632.

The spelling of 651637442 in words is "six hundred fifty-one million, six hundred thirty-seven thousand, four hundred forty-two".