642629461 has 8 divisors (see below), whose sum is σ = 681329880. Its totient is φ = 604028928.

The previous prime is 642629443. The next prime is 642629479. The reversal of 642629461 is 164926246.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (642629443) and next prime (642629479).

It can be written as a sum of positive squares in 4 ways, for example, as 168740100 + 473889361 = 12990^2 + 21769^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642629461 - 2⁷ = 642629333 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 (642629441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11506 + ... + 37651.

It is an arithmetic number, because the mean of its divisors is an integer number (85166235).

Almost surely, 2^642629461 is an apocalyptic number.

It is an amenable number.

642629461 is a deficient number, since it is larger than the sum of its proper divisors (38700419).

642629461 is a wasteful number, since it uses less digits than its factorization.

642629461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49943.

The product of its digits is 124416, while the sum is 40.

The square root of 642629461 is about 25350.1372974586. The cubic root of 642629461 is about 862.9524721320.

The spelling of 642629461 in words is "six hundred forty-two million, six hundred twenty-nine thousand, four hundred sixty-one".