642497701 has 4 divisors (see below), whose sum is σ = 657439552. Its totient is φ = 627555852.

The previous prime is 642497693. The next prime is 642497717. The reversal of 642497701 is 107794246.

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 642497701 - 2³ = 642497693 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 (642497731) 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, 7470861 + ... + 7470946.

It is an arithmetic number, because the mean of its divisors is an integer number (164359888).

Almost surely, 2^642497701 is an apocalyptic number.

It is an amenable number.

642497701 is a deficient number, since it is larger than the sum of its proper divisors (14941851).

642497701 is a wasteful number, since it uses less digits than its factorization.

642497701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14941850.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 642497701 is about 25347.5383617423. The cubic root of 642497701 is about 862.8934902996.

The spelling of 642497701 in words is "six hundred forty-two million, four hundred ninety-seven thousand, seven hundred one".