61001615 has 4 divisors (see below), whose sum is σ = 73201944. Its totient is φ = 48801288.

The previous prime is 61001599. The next prime is 61001617. The reversal of 61001615 is 51610016.

It is a happy number.

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 61001615 - 2⁴ = 61001599 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 (61001617) 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, 6100157 + ... + 6100166.

It is an arithmetic number, because the mean of its divisors is an integer number (18300486).

Almost surely, 2^61001615 is an apocalyptic number.

61001615 is a deficient number, since it is larger than the sum of its proper divisors (12200329).

61001615 is a wasteful number, since it uses less digits than its factorization.

61001615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12200328.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 61001615 is about 7810.3530650029. The cubic root of 61001615 is about 393.6531922921.

It can be divided in two parts, 61001 and 615, that added together give a palindrome (61616).

The spelling of 61001615 in words is "sixty-one million, one thousand, six hundred fifteen".