61211145 has 24 divisors (see below), whose sum is σ = 100313856. Its totient is φ = 31872288.

The previous prime is 61211113. The next prime is 61211167. The reversal of 61211145 is 54111216.

It is not a de Polignac number, because 61211145 - 2⁵ = 61211113 is a prime.

It is a super-2 number, since 2×61211145² = 7493608544422050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26632 + ... + 28838.

It is an arithmetic number, because the mean of its divisors is an integer number (4179744).

Almost surely, 2^61211145 is an apocalyptic number.

It is an amenable number.

61211145 is a deficient number, since it is larger than the sum of its proper divisors (39102711).

61211145 is a wasteful number, since it uses less digits than its factorization.

61211145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301 (or 2258 counting only the distinct ones).

The product of its digits is 240, while the sum is 21.

The square root of 61211145 is about 7823.7551725498. The cubic root of 61211145 is about 394.1033874542.

The spelling of 61211145 in words is "sixty-one million, two hundred eleven thousand, one hundred forty-five".