61211956 has 12 divisors (see below), whose sum is σ = 115361092. Its totient is φ = 28251648.

The previous prime is 61211933. The next prime is 61211957. The reversal of 61211956 is 65911216.

It can be written as a sum of positive squares in 2 ways, for example, as 14699556 + 46512400 = 3834^2 + 6820^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61211957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588525 + ... + 588628.

Almost surely, 2^61211956 is an apocalyptic number.

It is an amenable number.

61211956 is a deficient number, since it is larger than the sum of its proper divisors (54149136).

61211956 is a wasteful number, since it uses less digits than its factorization.

61211956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177170 (or 1177168 counting only the distinct ones).

The product of its digits is 3240, while the sum is 31.

The square root of 61211956 is about 7823.8070017096. The cubic root of 61211956 is about 394.1051279675.

The spelling of 61211956 in words is "sixty-one million, two hundred eleven thousand, nine hundred fifty-six".