761609021 has 4 divisors (see below), whose sum is σ = 765864000. Its totient is φ = 757354044.

The previous prime is 761608997. The next prime is 761609029. The reversal of 761609021 is 120906167.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120906167 = 2309 ⋅52363.

It is a cyclic number.

It is not a de Polignac number, because 761609021 - 2⁶ = 761608957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (761609029) 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, 2127221 + ... + 2127578.

It is an arithmetic number, because the mean of its divisors is an integer number (191466000).

Almost surely, 2^761609021 is an apocalyptic number.

It is an amenable number.

761609021 is a deficient number, since it is larger than the sum of its proper divisors (4254979).

761609021 is a wasteful number, since it uses less digits than its factorization.

761609021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254978.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 761609021 is about 27597.2647376511. The cubic root of 761609021 is about 913.2240912049.

The spelling of 761609021 in words is "seven hundred sixty-one million, six hundred nine thousand, twenty-one".