623491501 has 2 divisors, whose sum is σ = 623491502. Its totient is φ = 623491500.

The previous prime is 623491493. The next prime is 623491513. The reversal of 623491501 is 105194326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 317766276 + 305725225 = 17826^2 + 17485^2 .

It is a cyclic number.

It is not a de Polignac number, because 623491501 - 2³ = 623491493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623491571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311745750 + 311745751.

It is an arithmetic number, because the mean of its divisors is an integer number (311745751).

Almost surely, 2^623491501 is an apocalyptic number.

It is an amenable number.

623491501 is a deficient number, since it is larger than the sum of its proper divisors (1).

623491501 is an equidigital number, since it uses as much as digits as its factorization.

623491501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 623491501 is about 24969.8117934437. The cubic root of 623491501 is about 854.2995533163.

The spelling of 623491501 in words is "six hundred twenty-three million, four hundred ninety-one thousand, five hundred one".