61401999 has 16 divisors (see below), whose sum is σ = 82947200. Its totient is φ = 40399776.

The previous prime is 61401983. The next prime is 61402001. The reversal of 61401999 is 99910416.

It is not a de Polignac number, because 61401999 - 2⁴ = 61401983 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 (61401299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95172 + ... + 95814.

It is an arithmetic number, because the mean of its divisors is an integer number (5184200).

Almost surely, 2^61401999 is an apocalyptic number.

61401999 is a deficient number, since it is larger than the sum of its proper divisors (21545201).

61401999 is a wasteful number, since it uses less digits than its factorization.

61401999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 61401999 is about 7835.9427639564. The cubic root of 61401999 is about 394.5125622284.

The spelling of 61401999 in words is "sixty-one million, four hundred one thousand, nine hundred ninety-nine".