61505454 has 16 divisors (see below), whose sum is σ = 124744320. Its totient is φ = 20212920.

The previous prime is 61505449. The next prime is 61505459. The reversal of 61505454 is 45450516.

It is an interprime number because it is at equal distance from previous prime (61505449) and next prime (61505459).

It is a super-2 number, since 2×61505454² = 7565841743492232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61505459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71764 + ... + 72615.

It is an arithmetic number, because the mean of its divisors is an integer number (7796520).

Almost surely, 2^61505454 is an apocalyptic number.

61505454 is an abundant number, since it is smaller than the sum of its proper divisors (63238866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61505454 is a wasteful number, since it uses less digits than its factorization.

61505454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144455.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 61505454 is about 7842.5412973092. The cubic root of 61505454 is about 394.7340066809.

It can be divided in two parts, 61 and 505454, that added together give a triangular number (505515 = T₁₀₀₅).

The spelling of 61505454 in words is "sixty-one million, five hundred five thousand, four hundred fifty-four".