61211155 has 16 divisors (see below), whose sum is σ = 76857984. Its totient is φ = 46750720.

The previous prime is 61211113. The next prime is 61211167. The reversal of 61211155 is 55111216.

It is a happy number.

It is not a de Polignac number, because 61211155 - 2¹¹ = 61209107 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6459 + ... + 12811.

It is an arithmetic number, because the mean of its divisors is an integer number (4803624).

Almost surely, 2^61211155 is an apocalyptic number.

61211155 is a deficient number, since it is larger than the sum of its proper divisors (15646829).

61211155 is a wasteful number, since it uses less digits than its factorization.

61211155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6446.

The product of its digits is 300, while the sum is 22.

The square root of 61211155 is about 7823.7558116291. The cubic root of 61211155 is about 394.1034089157.

The spelling of 61211155 in words is "sixty-one million, two hundred eleven thousand, one hundred fifty-five".