61002091 has 4 divisors (see below), whose sum is σ = 61572312. Its totient is φ = 60431872.

The previous prime is 61002077. The next prime is 61002119. The reversal of 61002091 is 19020016.

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 61002091 - 2¹⁵ = 60969323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61002041) 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, 284950 + ... + 285163.

It is an arithmetic number, because the mean of its divisors is an integer number (15393078).

Almost surely, 2^61002091 is an apocalyptic number.

61002091 is a deficient number, since it is larger than the sum of its proper divisors (570221).

61002091 is a wasteful number, since it uses less digits than its factorization.

61002091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570220.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 61002091 is about 7810.3835373175. The cubic root of 61002091 is about 393.6542161909.

The spelling of 61002091 in words is "sixty-one million, two thousand, ninety-one".