642000137 has 4 divisors (see below), whose sum is σ = 648356676. Its totient is φ = 635643600.

The previous prime is 642000131. The next prime is 642000157. The reversal of 642000137 is 731000246.

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

It can be written as a sum of positive squares in 2 ways, for example, as 472453696 + 169546441 = 21736^2 + 13021^2 .

It is a cyclic number.

It is not a de Polignac number, because 642000137 - 2⁸ = 641999881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642000131) 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, 3178118 + ... + 3178319.

It is an arithmetic number, because the mean of its divisors is an integer number (162089169).

Almost surely, 2^642000137 is an apocalyptic number.

It is an amenable number.

642000137 is a deficient number, since it is larger than the sum of its proper divisors (6356539).

642000137 is a wasteful number, since it uses less digits than its factorization.

642000137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6356538.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 642000137 is about 25337.7216221191. The cubic root of 642000137 is about 862.6706850325.

The spelling of 642000137 in words is "six hundred forty-two million, one hundred thirty-seven", and thus it is an aban number.