61888251 has 4 divisors (see below), whose sum is σ = 82517672. Its totient is φ = 41258832.

The previous prime is 61888249. The next prime is 61888261. The reversal of 61888251 is 15288816.

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

It is not a de Polignac number, because 61888251 - 2¹ = 61888249 is a prime.

It is a super-2 number, since 2×61888251² = 7660311223678002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61888201) 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, 10314706 + ... + 10314711.

It is an arithmetic number, because the mean of its divisors is an integer number (20629418).

Almost surely, 2^61888251 is an apocalyptic number.

61888251 is a deficient number, since it is larger than the sum of its proper divisors (20629421).

61888251 is a wasteful number, since it uses less digits than its factorization.

61888251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20629420.

The product of its digits is 30720, while the sum is 39.

The square root of 61888251 is about 7866.9086050367. The cubic root of 61888251 is about 395.5512274065.

The spelling of 61888251 in words is "sixty-one million, eight hundred eighty-eight thousand, two hundred fifty-one".