61099071 has 24 divisors (see below), whose sum is σ = 94821552. Its totient is φ = 34848000.

The previous prime is 61099021. The next prime is 61099091. The reversal of 61099071 is 17099016.

61099071 = 203² + 204² + ... + 576².

It is not a de Polignac number, because 61099071 - 2⁶ = 61099007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61099021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1221 + ... + 11121.

It is an arithmetic number, because the mean of its divisors is an integer number (3950898).

Almost surely, 2^61099071 is an apocalyptic number.

61099071 is a deficient number, since it is larger than the sum of its proper divisors (33722481).

61099071 is a wasteful number, since it uses less digits than its factorization.

61099071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9943 (or 9932 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 61099071 is about 7816.5894736771. The cubic root of 61099071 is about 393.8627138139.

It can be divided in two parts, 610 and 99071, that added together give a triangular number (99681 = T₄₄₆).

The spelling of 61099071 in words is "sixty-one million, ninety-nine thousand, seventy-one".