623409031691 has 4 divisors (see below), whose sum is σ = 628317764352. Its totient is φ = 618500299032.

The previous prime is 623409031681. The next prime is 623409031703. The reversal of 623409031691 is 196130904326.

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

It is a cyclic number.

It is not a de Polignac number, because 623409031691 - 2²² = 623404837387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623409031621) 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, 2454366140 + ... + 2454366393.

It is an arithmetic number, because the mean of its divisors is an integer number (157079441088).

Almost surely, 2^623409031691 is an apocalyptic number.

623409031691 is a deficient number, since it is larger than the sum of its proper divisors (4908732661).

623409031691 is a wasteful number, since it uses less digits than its factorization.

623409031691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4908732660.

The product of its (nonzero) digits is 209952, while the sum is 44.

The spelling of 623409031691 in words is "six hundred twenty-three billion, four hundred nine million, thirty-one thousand, six hundred ninety-one".