61401557 has 6 divisors (see below), whose sum is σ = 71426358. Its totient is φ = 52629864.

The previous prime is 61401533. The next prime is 61401577. The reversal of 61401557 is 75510416.

It can be written as a sum of positive squares in only one way, i.e., 57365476 + 4036081 = 7574^2 + 2009^2 .

It is not a de Polignac number, because 61401557 - 2¹² = 61397461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61401577) 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, 626498 + ... + 626595.

It is an arithmetic number, because the mean of its divisors is an integer number (11904393).

Almost surely, 2^61401557 is an apocalyptic number.

It is an amenable number.

61401557 is a deficient number, since it is larger than the sum of its proper divisors (10024801).

61401557 is a wasteful number, since it uses less digits than its factorization.

61401557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253107 (or 1253100 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 61401557 is about 7835.9145605347. The cubic root of 61401557 is about 394.5116155981.

The spelling of 61401557 in words is "sixty-one million, four hundred one thousand, five hundred fifty-seven".