61002155 has 4 divisors (see below), whose sum is σ = 73202592. Its totient is φ = 48801720.

The previous prime is 61002143. The next prime is 61002157. The reversal of 61002155 is 55120016.

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

It is not a de Polignac number, because 61002155 - 2¹² = 60998059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61002157) 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, 6100211 + ... + 6100220.

It is an arithmetic number, because the mean of its divisors is an integer number (18300648).

Almost surely, 2^61002155 is an apocalyptic number.

61002155 is a deficient number, since it is larger than the sum of its proper divisors (12200437).

61002155 is a wasteful number, since it uses less digits than its factorization.

61002155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12200436.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 61002155 is about 7810.3876344263. The cubic root of 61002155 is about 393.6543538575.

The spelling of 61002155 in words is "sixty-one million, two thousand, one hundred fifty-five".