61974981 has 6 divisors (see below), whose sum is σ = 89519430. Its totient is φ = 41316648.

The previous prime is 61974973. The next prime is 61975003. The reversal of 61974981 is 18947916.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 57244356 + 4730625 = 7566^2 + 2175^2 .

It is not a de Polignac number, because 61974981 - 2³ = 61974973 is a prime.

It is a super-2 number, since 2×61974981² = 7681796539900722, which contains 22 as substring.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61974901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3443046 + ... + 3443063.

It is an arithmetic number, because the mean of its divisors is an integer number (14919905).

Almost surely, 2^61974981 is an apocalyptic number.

It is an amenable number.

61974981 is a deficient number, since it is larger than the sum of its proper divisors (27544449).

61974981 is a wasteful number, since it uses less digits than its factorization.

61974981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6886115 (or 6886112 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 61974981 is about 7872.4190056170. The cubic root of 61974981 is about 395.7359159074.

The spelling of 61974981 in words is "sixty-one million, nine hundred seventy-four thousand, nine hundred eighty-one".