61500739 has 4 divisors (see below), whose sum is σ = 64737640. Its totient is φ = 58263840.

The previous prime is 61500737. The next prime is 61500757. The reversal of 61500739 is 93700516.

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 61500739 - 2¹ = 61500737 is a prime.

It is a super-2 number, since 2×61500739² = 7564681795092242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61500739.

It is not an unprimeable number, because it can be changed into a prime (61500731) 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, 1618422 + ... + 1618459.

It is an arithmetic number, because the mean of its divisors is an integer number (16184410).

Almost surely, 2^61500739 is an apocalyptic number.

61500739 is a deficient number, since it is larger than the sum of its proper divisors (3236901).

61500739 is a wasteful number, since it uses less digits than its factorization.

61500739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3236900.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 61500739 is about 7842.2406874566. The cubic root of 61500739 is about 394.7239196708.

The spelling of 61500739 in words is "sixty-one million, five hundred thousand, seven hundred thirty-nine".