619661449 has 27 divisors (see below), whose sum is σ = 713568807. Its totient is φ = 537688800.

The previous prime is 619661429. The next prime is 619661467. The reversal of 619661449 is 944166916.

The square root of 619661449 is 24893.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 351750025 + 267911424 = 18755^2 + 16368^2 .

It is not a de Polignac number, because 619661449 - 2²⁵ = 586107017 is a prime.

It is a super-2 number, since 2×619661449² = 767960622753559202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 619661399 and 619661408.

It is not an unprimeable number, because it can be changed into a prime (619661429) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8488477 + ... + 8488549.

Almost surely, 2^619661449 is an apocalyptic number.

619661449 is the 24893-rd square number.

619661449 is the 12447-th centered octagonal number.

It is an amenable number.

619661449 is a deficient number, since it is larger than the sum of its proper divisors (93907358).

619661449 is an equidigital number, since it uses as much as digits as its factorization.

619661449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 115 counting only the distinct ones).

The product of its digits is 279936, while the sum is 46.

The cubic root of 619661449 is about 852.5466641123.

The spelling of 619661449 in words is "six hundred nineteen million, six hundred sixty-one thousand, four hundred forty-nine".