1537661949 has 16 divisors (see below), whose sum is σ = 2066467200. Its totient is φ = 1017014976.

The previous prime is 1537661933. The next prime is 1537661977. The reversal of 1537661949 is 9491667351.

It is not a de Polignac number, because 1537661949 - 2⁴ = 1537661933 is a prime.

It is a super-3 number, since 3×1537661949³ (a number of 29 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1537661149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197472 + ... + 205110.

It is an arithmetic number, because the mean of its divisors is an integer number (129154200).

Almost surely, 2^1537661949 is an apocalyptic number.

It is an amenable number.

1537661949 is a deficient number, since it is larger than the sum of its proper divisors (528805251).

1537661949 is a wasteful number, since it uses less digits than its factorization.

1537661949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8164.

The product of its digits is 1224720, while the sum is 51.

The square root of 1537661949 is about 39213.0328972397. The cubic root of 1537661949 is about 1154.2156425747.

The spelling of 1537661949 in words is "one billion, five hundred thirty-seven million, six hundred sixty-one thousand, nine hundred forty-nine".