61499231 has 4 divisors (see below), whose sum is σ = 61517352. Its totient is φ = 61481112.

The previous prime is 61499173. The next prime is 61499279. The reversal of 61499231 is 13299416.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61499231 is a prime.

It is a super-2 number, since 2×61499231² = 7564310827182722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61499191 and 61499200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61499531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2276 + ... + 11321.

It is an arithmetic number, because the mean of its divisors is an integer number (15379338).

Almost surely, 2^61499231 is an apocalyptic number.

61499231 is a deficient number, since it is larger than the sum of its proper divisors (18121).

61499231 is a wasteful number, since it uses less digits than its factorization.

61499231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18120.

The product of its digits is 11664, while the sum is 35.

The square root of 61499231 is about 7842.1445408766. The cubic root of 61499231 is about 394.7206934303.

The spelling of 61499231 in words is "sixty-one million, four hundred ninety-nine thousand, two hundred thirty-one".