696742621 has 4 divisors (see below), whose sum is σ = 698173792. Its totient is φ = 695311452.

The previous prime is 696742601. The next prime is 696742649. The reversal of 696742621 is 126247696.

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.

It is a cyclic number.

It is not a de Polignac number, because 696742621 - 2¹³ = 696734429 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 (696742601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 714855 + ... + 715828.

It is an arithmetic number, because the mean of its divisors is an integer number (174543448).

Almost surely, 2^696742621 is an apocalyptic number.

It is an amenable number.

696742621 is a deficient number, since it is larger than the sum of its proper divisors (1431171).

696742621 is a wasteful number, since it uses less digits than its factorization.

696742621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431170.

The product of its digits is 217728, while the sum is 43.

The square root of 696742621 is about 26395.8826524138. The cubic root of 696742621 is about 886.5246028228.

The spelling of 696742621 in words is "six hundred ninety-six million, seven hundred forty-two thousand, six hundred twenty-one".