121649019 has 32 divisors (see below), whose sum is σ = 171294720. Its totient is φ = 76725792.

The previous prime is 121648999. The next prime is 121649029. The reversal of 121649019 is 910946121.

It is not a de Polignac number, because 121649019 - 2⁵ = 121648987 is a prime.

It is a super-2 number, since 2×121649019² = 29596967647324722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121649029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 746232 + ... + 746394.

It is an arithmetic number, because the mean of its divisors is an integer number (5352960).

Almost surely, 2^121649019 is an apocalyptic number.

121649019 is a deficient number, since it is larger than the sum of its proper divisors (49645701).

121649019 is a wasteful number, since it uses less digits than its factorization.

121649019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 121649019 is about 11029.4614102412. The cubic root of 121649019 is about 495.4914942759.

The spelling of 121649019 in words is "one hundred twenty-one million, six hundred forty-nine thousand, nineteen".