61499387 has 4 divisors (see below), whose sum is σ = 65117016. Its totient is φ = 57881760.

The previous prime is 61499377. The next prime is 61499393. The reversal of 61499387 is 78399416.

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

It is a cyclic number.

It is not a de Polignac number, because 61499387 - 2⁶ = 61499323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61499377) 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, 1808789 + ... + 1808822.

It is an arithmetic number, because the mean of its divisors is an integer number (16279254).

Almost surely, 2^61499387 is an apocalyptic number.

61499387 is a deficient number, since it is larger than the sum of its proper divisors (3617629).

61499387 is a wasteful number, since it uses less digits than its factorization.

61499387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3617628.

The product of its digits is 326592, while the sum is 47.

The square root of 61499387 is about 7842.1544871292. The cubic root of 61499387 is about 394.7210271818.

It can be divided in two parts, 614 and 99387, that added together give a palindrome (100001).

The spelling of 61499387 in words is "sixty-one million, four hundred ninety-nine thousand, three hundred eighty-seven".