65921139 has 6 divisors (see below), whose sum is σ = 95219436. Its totient is φ = 43947420.

The previous prime is 65921137. The next prime is 65921179. The reversal of 65921139 is 93112956.

It is not a de Polignac number, because 65921139 - 2¹ = 65921137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65921137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3662277 + ... + 3662294.

It is an arithmetic number, because the mean of its divisors is an integer number (15869906).

Almost surely, 2^65921139 is an apocalyptic number.

65921139 is a deficient number, since it is larger than the sum of its proper divisors (29298297).

65921139 is a wasteful number, since it uses less digits than its factorization.

65921139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7324577 (or 7324574 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 65921139 is about 8119.1833948988. The cubic root of 65921139 is about 403.9629802206.

The spelling of 65921139 in words is "sixty-five million, nine hundred twenty-one thousand, one hundred thirty-nine".